Grinder



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GRINDER Filed Jan. 22, 1960 4 Sheets 5 4 INVENTOK United States Patent Office 3,044,220 GRINDER Eher S. Emerson, Daly City, Calif. (129 El Camino Real, Burlingame, Calif.) Filed Jan. 22, 1960, Ser. No. 4,137 9 Claims. (Cl. 51-100) Patented July 17, 1962.

base; They are made of flat plates 38 and 40 and are parallel to each other and perpendicular to the base 28. The templates have guide openings 42 and 44- therein, the two guide openings being identical in shape and being responsible for the constraining of grinding wheel 46 to follow the contour of surface 34 and grind it smooth.

A clamp 48 is fixed to the base 20, for instance by bolts 53. The clamp has an upper section 52 and a lower section 54. The lower section is attached by the bolts 50 to base 28, and the upper section is secured by studs 56 and nuts 58 to the lower section. The two sections of the clamp have cooperating openings 57 and 53 of a shape and size to receive and hold the pump casing 36 in place therein. Although onetype of clamp is illustrated, it is understood that other types of clamps Hydraulic pumps for farm use or for other use have an oval-shaped pump casing. After considerable use of the pump, the pump chamber becomes rough and the pump either loses efficiency or will not function at all. A grinder in accordance with the invention makes it possible to renew the surface without a great deal of expensive equipment and to do the job very effectively. Although the pump chamber may not be truly elliptical, ordinarily they are approximately so, and therefore this term is used subsequently. It is to be understood that the term elliptical is used merely to identify the pump chamber as being non-circular. However, the principles of the invention are applicable in connection with the grinding of various irregular shapes as well as true circles.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts'throughout, and in which:

FIGURE 1 is a perspective view of a typical grinder in accordance with the invention. The grinder including a complete assembly in operation.

FIGURE 2 is an enlarged longitudinal sectional view of a part of the assembly in FIGURE 1.

FIGURE 3 is a transverse sectional view taken on the line 33 of FIGURE 2.

FIGURE 4 is a transverse sectional view taken on the line 4-4 of FIGURE 2.

FIGURE 5 is a perspective view showing an attachment for the grinder used on the grinder.

FIGURE 6 is a sectional view taken on the line 6-6 of FIGURE 5.

FIGURE 7 is a top view of FIGURE 5.

FIGURE 8 is a sectional view taken on the line 88 of. FIGURE 7.

In the accompanying drawings there is an illustration of an electric motor 10 inasmuch as it is preferred to operate the grinder by means of this type of torque source.v A flexible transmission 12 is connected with the power output shaft 14 of the motor. The flexible transmission preferably consists of a sheath 16 having couplings 18 and 20 at the opposite ends thereof, at least one of which is fixed and preferably both of which are fixed with respect to the flexible drive cable 22 located within the sheath. The switch on motor 16' is not shown inasmuch as it is purely conventional and well known.

The grinder assembly is made of a base 28 to which a pair of templates 30 and 32 are fixed. When the assembly is used for aparticular special purpose, for example grinding the inner surface 34 of pump casing 36,

the templates 3i) and 32 may be welded directly to the i may be substituted. However, it is importantwthat the clamp be located between the templates 30 and 32 (FIG- URE 2). V

There are means for manually movingthe grinding wheel 46 so that it follows the shape of the template openings 42 and 44. These means consist of two handies 59 and 66 mounted for rotation on drive spindle 62. The drive spindle has an intermediate part 64 with threads thereon. Two nuts 65- and 66 are on the threaded part 64 of spindle62, and there are two backing washers 67 also on threaded part 64 that clamp against the faces of grinding wheel 46. This holds the grinding wheel on the spindle but enables the grinding wheel to be re moved, dressed and replaced or simply removed and replaced.

Handles 59 and 60 are made of sleeves and are located on the outer sides of templates 3t) and 32. Sleeve 60 has two conventional antifriction bearings 69 and 70 pressed or otherwise secured in the bore thereof and dis: posed on the outer end 73 of spindle 62. Antifriction bearings 74 and '75 similarly mount handle 59 but on the opposite end 76 of spindle 62. A bolt withv a large head or a bolt '77 with a washer thereon, is threaded in the end 76 of spindle 62 and prevents the handle 59 from separating from the spindle 62 by contacting antifriction bearings 74.

Two guides 79 and 80 are rotatably mounted on spindle 62. The guides are preferably ordinary pulleys. However, they have antifriction bearings 81 and 82 pressed in the center thereof and also pressed or otherwise separably connected with spindle 62. The spacing of the guides is such that the flanged peripheries fit with in template openings 42 and 44.

The flexible shaft 22 has a coupling at one end thereof. The coupling may assume the form of a bolt threaded into a tapped opening 91 at the extremity of part 73 of spindle 62. This establishes a drive connection between the power output shaft 14 of motor 10 and spindle 62.

In use, the work, for example pump casing 36, is attached to base 28 and automatically positioned by clamp 48 between templates 30 and 32. The user places both hands on handles 59 and 66. When the motor is energized, spindle 62 is rotated. is moved to bring the periphery of the wheel 46 in sur face 34. This movement is manually obtained by pressing the guides 79 and 86 against the edges of template openings 42 and 44 and following the edges of these openings. 7

Reference is now made to FIGURES 5,-8 inclusive. The basic grinder assembly is the same as the assembly shown in FIGURE 1 however, instead of manually operating the assembly by using handles 59 and 60, attachment 90 is used for this purpose. Attachment 90 provides a convenience and leverage for the movement of the handles 59 and 60 and consists of a pair of posts 91 However, the spindle and 92 with bearings 93 and 94 at the upper ends thereof, together with mounting brackets 96 and 97 at the lower ends of the posts. The mounting brackets are connected, for example by bolts 98, to base 28. An oscillating shaft 99 is mounted for rotation in bearings 93 and 94, and an angle member 100 is welded to the shaft lengthwise thereof. 7

An operating lever 102 is secured to angle member 100, for example by fitting into a collar 104 that is welded to one flangeroi angle member 100. Another operating lever 106 is pivoted to the angle member 100 and extends upwardly at approximately right angles to lever or handle 102. The pivotal connection is made by means of a pair of mounting ears 108 welded to the angle member 100 and/or collar 104. A pivot bolt 110 extends through openings in mounting ears 108 and through an opening in the lower extremity of lever 106. Link 114'is connected by pivot 116 to lever 106 adjacent to the pivot 110 (and the link 114 has a pivot bolt 118 or the like passed therethrough.

The pivot bolt 118 also extends through aligned openings in the overlapped ends 120 and 122 of links 124 and 126 and the oflset end of a bracket 121. The links 124 and 126 rest on the top surface of angle member 100 and bracket 121 is fixed to arm 126 by conventional means as welding. Fulcrum members 128 and 130 are secured to the angle member 100 and pass through slots 132 and 134 formed in the links 124 and 126. Operating links 138 and 140 (FIGURE are pivoted to the outer ends of links 124 and 126, and the inner extremities of operating links 138 and 140 are equipped withcircular clamps 146 and 148 which are engaged around handles 59 and 60.

A pair of rigid sides 150 and 152 are secured to the ends of angle member 100, and the inner ends of sides 150 and 152 have U-shaped saddles 158 and 160 which also are engaged over the handles 59 and 60.

The operation of attachment 90 is as follows: for up and down movement of shaft 62 the lever or handle 102 is moved up or down thereby causing shaft 99 to oscil-' sides 150 and 152, and this elevates handles 59 and 60- (or lowers them). a V

For forward and rearward movement of shaft 62, the handle 106 is moved forward or rearward thereby causing links 124 and 126 to oscillate about the vertical axes of fulcrums 128 and 130. The result is that links 138 and 140 are moved in and out thereby imparting movement to handles 59 and 60 and consequently, to shaft 62, in a direction essentially normal to the direction of movement which is caused by operation of handle 102.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to'the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within therscope of the invention as claimed.

What is claimed as new is as follows:

1. A grinder assembly comprising a base, a pair of templates having template openings of the same size and shape and secured in spaced relationship on said base,

templates having template openings of the same size and shape and secured in spaced relationship on said base, a holding device located between said templates and connected with said base, said holding device adapted to support a workpiece between'said templates, a rotatable spindle having circular guide means concentric therewith on its outer surface, said guide means directly contacting said templates within the openings and guiding said spindle as it rotates, said spindle adapted to support a grinding element, unobstructed handles rotatably mounted on said spindle by means of bearings at the ends thereof in order to manually move or control the spindle while it is being rotated. 7

3. A grinder assembly comprising a base, a pair of templates having template openings of the same size and shape and secured in spaced relationship on said base, a holding device located between said templates and connected with said base, said holding device adapted to support a workpiece between said templates, a rotatable spindle having circular guide means concentric there-, with on its outer surface, said guide means directly contacting said templates within the openings and guiding said spindle as it rotates, said spindle adapted to support a grinding element, handles connected with said spindle at the ends thereof in order to manually move or control the spindle while it is being rotated, said guide means including flanged wheels, antifriction means mounting said flanged wheels on said spindle, and the flanged wheels engaging the edges of said template opemngs. V 4. A grinder assembly comprising a base, a pair of templates having template openings of the same size and shape and. secured in spacedrelationship on said base, a holding device located between said templates and connected with said base, said holding device adapted to support a workpiece between said templates, a rotatable spindle having circularguide meansconcentric therewith on its outer surface, said guide means directly contacting said templates within the openings and guiding said spindle as it rotates, said spindle adapted to support a grinding element, handles connected with said spindle at the ends'thereof in order to manually move or control the spindle while it is being rotated, said handles including annular sleeves having unobstructed outer gripping surfaces, antifriction means mounting said sleeves on the ends of said spindle and laterally outwardly from said templates.

5. In a grinding assembly for the interior of a pump casing, a base, a clamp secured to said base and adapted to support the pump casing in a fixed position, a pair of template plates secured to said base and being essentially parallel to each other and on opposite sides of said clamp, said template plates having template openings therein, a power driven spindle, guides movably carried by said spindle and engaging the edges of said template openings,

, means on said spindle to support a grinding element in a holding device located between said templates and connected with said base, said holding device adapted to support, a workpiece between said templates, a rotatable spindle having circular guide means concentric therewith on its outer surface, said guide means directly contacting said templates within the openings and guidingsaid a. spindle as it rotates, said spindle adapted to support a grinding element, unobstructed handles connected with said spindle at the ends thereof in order to manually move or control the spindle while it is being rotated.

2. A grinder assembly comprising a base, a pair of the region of said clamp, and manual means connected with said spindle for moving said spindle in a path of travel constrained by the engagement of said guides with the edges of said template openings, said manual means comprising a pair of handles connected with said spindle for rotational movement, said guides including a pair of flanged wheels, autifriction means connecting said wheels with said spindle, and said flanged wheels having peripheries in engagement with the edges of said template openings.

6. In a grinding assembly'for the interior of a pump casing, a base, a clamp secured to said base and adapted to support the pump casing in a fixed position, a pair of template plates secured to said base and being essentially parallel to each other and on opposite sides of said clamp, said template plates having template openings therein, a power driven spindle, guides movably carried by said spindle and engaging the edges of said template openings,

means on said spindle fixed to a grinding element in the region of said clamp, and manual means connected with said spindle for moving said spindle in a path of travel constrained by the engagement of said guides with the edges of said template openings, said manual means comprising a pair of unobstructed handles having outer gripping surfaces connected with said spindle for rotational movement, said power driven spindle having a coupling at one end thereof, and a mechanical motion transmission connected by said coupling to said spindle to rotate said spindle.

7. In a grinding assembly for the interior of a pump casing, a base, a clamp secured to said base and adapted to support the pump casing in a fixed position, a pair of template plates secured to said base and being essentially parallel to each other and on opposite sides of said clamp, said template plates having template openings therein, a power driven spindle, guides movably carried by said spindle and engaging the edges of said template openings, means on said spindle to support a grinding element in the region of said clamp, and manual means connected with said spindle for moving said spindle in a path of travel constrained by the engagement of said guides with the edges of said template openings, said manual means comprising a pair of handles connected with said spindle for rotational movement, and lever means pivoted to said base and having means engageable with said pair of handles for moving said handles laterally and vertically.

8. The subject matter of claim 7 wherein said lever means engageable with said handles include a first lever, a shaft, a member secured to said shaft, said lever secured to said member to rock said member on said shaft, sides connected with said member, and means associated with said sides for engaging said handles.

9. The subject matter of claim 8 wherein said lever means further includes a second lever connected with said member, links pivotally connected to said member, means pivotally connecting said links to said second lever, and means for transmitting movement of said links to said handles in -a direction transverse to the movement imparted to said handles by said sides.

References Cited in the file of this patent UNITED STATES PATENTS 481,259 Feicker Aug. 23, 1892 826,755 Waldron July 24, 1906 1,260,080 Singer Mar. 19, 1918 1,332,437 Ely Mar. 2, 1920 1,998,642 Smith Apr. 23, 1935 

